Furnace



(.No Model.)

R. L. WALKER. FURNACE.

N0; 439,706. Patented Nov. 1, 1890.

UNITE STATES PATENT OFFICE.

ROBERT LOUDON WALKER, OF BOSTON, MASSACHUSETTS.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 439,706, dated November 4, 1890.

Application filed March 8, 1890.

To all whom it may concern.-

Be it known that I, ROBERT LoUDoN WALKER, of Boston, in the county of Suffolk, and State of Massachusetts, have invented a new and useful Improvement in Furnaces, of which the following is a specification, reference being had to the accompanying drawings, in which 7 Figure 1 is a longitudinal section of a part of one form of boiler embodying my invention,

and Fig. 2 is a section at line 3 3 of Fig. 1.

My invention is an improvement on the furnace describedin my pending application, Serial No. 339,005, filed February 3, 1890; and it consists in the combination of a deflector with a grate, one portion of which is shaken independently of the other portion.

In the drawings, A A is the grate, B the fire-box, B the deflector, and D the ash-pit. Deflector B is so arranged in the fire-box that it directs the products of combustion arising from the duller or greener part of the fire on one section of the grate over a brighter part of the fire on an independent section of the grate.

I have discovered that by keeping a part of the fire much brighter than the rest of the fire the products of combustion .which pass over this quickened portion of the fire are consumed, smoke prevented, and fuel saved. I accordingly form the grate in sections A A, and make one section A, over which products of combustion pass to the flues, so that it can be rocked or shaken independently of the rest of the grate. Section A is shown as a rocking grate of ordinary construction, capable of being rocked by a rod a in the usual way. The rest of the grate may be either a rocking grate, as the part A in Fig. 1, or a stationary grate, as shown at A in Fig.2. By agitating section A with sufficient frequency to keep the coal on it much looser and freer than the coal on the other part A of the grate, a much stronger draft is produced through section A than through section A, and when the products of combustion are deflected upon and over this quickened fire by the deflector they are very perfectly consumed.

I am aware of McDowells patent, No. 406,757, dated July 9, 1889, Nepillys patent, No. 261,474, dated July 18, 1882, and Ritters patent, No. 290,270, dated December 18, 1883, and disclaim all that is shown in them, fur- Serial No. 343,143. (No model.)

naces embodying my invention diifering materially from the furnace shown in McDowells patent in having a shaking grate under that part of the fire upon which the products of combustion arising from the green part of the fire are deflected. In McDowells furnace there is no provision for nor any suggestion of quickening one part of the fire, and the deflector does not direct products of combustion upon a shaking grate, but upon a trapdoor, which is lowered to remove clinkers, but is not and cannot be practically shaken. In Nepillys contrivance the products of combustion arising from the brighter portion of the fire are deflected over the green fire. This is obviously a radically different plan and construction from mine.

In Ritters furnace there is no deflector, and thereis no suggestion in his patent of directing products of combustion arising from green fire o\'er quickene'd fire, and, in fact, his fire is of substantially uniform intensity, for his coal is, by a peculiar construction, directed over the whole grate-surface. Ritters arch is a simple arched roof for the firechamber, and this roof has no downward projection to alter the course of the products of combustion. My new furnace also differs radically from both Ritters and McDowells in having a shaking grate, where Ritter and McDowell have trap-doors that may, indeed, be shaken, but which are not shaking grates in any practical sense or for any practical purpose. Should it be attempted to effectively shake Ritters trap-door K, a considerable portion of the unconsumed coal in the fire over it would be lost and much fuel wasted. The same is true to a far greater degree of McDowells furnace, owing to the inclination of lWIcDowells trap-door M.

What I claim is- In a furnace, the combination of a deflector B, with a grate madein independent sections A A, the section A being a shaking grate, and the deflector B projecting into the firebox toward the grate to direct products of combustion from the greener tire on section A over the brighter fire on section A, all substantially as and for the purpose described.

ROBERT LOUDON IVALKER. 

